econometrics

Concise Oxford English Dictionary © 2008 Oxford University Press:
econometrics /ɪˌkɒnəˈmɛtrɪks/

▶plural noun [treated as sing.] the branch of economics concerned with the use of mathematical methods (especially statistics) in describing economic systems.

– derivatives
econometric adjective,
econometrical adjective,
econometrician noun,
econometrist noun.

– origin 1930s: from economy, on the pattern of words such as biometrics.